@article{fdi:010078218,
  title = {{S}patial variation in stable isotopes and fatty acid trophic markers in albacore tuna ({T}hunnus alalunga) from the western {I}ndian {O}cean},
  author = {{D}hurmeea, {Z}. and {P}ethybridge, {H}. and {L}anglais, {C}. and {S}omes, {C}. {J}. and {N}ikolic, {N}atacha and {B}ourjea, {J}. and {A}ppadoo, {C}. and {B}odin, {N}athalie},
  editor = {},
  language = {{ENG}},
  abstract = {{A}lbacore tuna ({T}hunnus alalunga) is a highly economically important species in the western {I}ndian {O}cean. {H}owever, knowledge of its ecological and nutritional characteristics, essential for proper management of the species, is lacking in the region. {T}he trophodynamics of the {I}ndian {O}cean albacore was thus examined using known fatty acid trophic markers ({FATM}s) of primary producers, nutritional condition indices ({NCI}s) (omega-3/omega-6 ratio and total fatty acid content ({TFA})), and baseline and lipid corrected stable isotope of carbon (delta {C}-13(corr)) and nitrogen (delta(15)b(corr)), measured in the muscle tissue. {W}e applied generalized additive mixed models to understand the spatiotemporal patterns and drivers of these tracers, taking into consideration several intrinsic and extrinsic variables: fish size, fishing position, month, chlorophyll-a and sea surface temperature ({SST}). {B}oth chlorophyll-a and {SST} were significant as single explanatory variables for all tracers with {SST} being the best predictor for docosahexaenoic acid/eicosapentaenoic acid ratio, the omega-6 protists {FATM}, omega-3/omega-6 ratio, delta {C}-13(corr) and delta {N}-15(corr). {TFA} was best predicted by fish size only. {H}igher primary productivity, as inferred by high 613{C},0 values and diatom contribution, nutritional condition and trophic position, as inferred by high delta {N}-15(corr) values, were observed in albacore from the temperate southern waters than in the northern tropical regions. {R}elationships between environmental variables and corrected stable isotopes, {FATM}s confirm that ocean warming and changes in primary productivity will impact nutrient flow and energy transfer in the marine food web which may have negative nutritional outcomes for albacore. {T}his knowledge is particularly crucial in areas where oceanographic conditions and seawater temperatures are changing at a fast rate and should also be taken into consideration by fisheries managers.},
  keywords = {{T}rophodynamics ; {P}hytoplankton ; {E}nvironmental parameters ; {C}limate change ; {OCEAN} {INDIEN} ; {SEYCHELLES} ; {MOZAMBIQUE} {CANAL} ; {MAURICE} ; {REUNION}. {AFRIQUE} {DU} {SUD}},
  booktitle = {},
  journal = {{D}eep-{S}ea {R}esearch {P}art {I} : {O}ceanographic {R}esearch {P}apers},
  volume = {161},
  numero = {},
  pages = {art. 103286 [15 p.]},
  ISSN = {0967-0637},
  year = {2020},
  DOI = {10.1016/j.dsr.2020.103286},
  URL = {https://www.documentation.ird.fr/hor/fdi:010078218},
}